Question

我想创建一个按钮，让它在触摸时播放声音。到目前为止，我可以制作按钮，但我无法播放声音。这就是我所拥有的：

//loads wav file into SoundID
NSURL *buttonURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"medic_taunts01" ofType:@"wav"]];
AudioServicesCreateSystemSoundID((__bridge CFURLRef)buttonURL, &SoundID);

//creates button
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[scrollview addSubview:button]

//this line is the problem
[button addTarget:self  action:@selector(AudioServicesPlaySystemSound((SoundID)) forControlEvents:UIControlEventTouchDown];

出于某种原因，xcode不允许我直接通过按钮点击播放声音。如何触摸按钮播放SoundID？

Answer 1

您的按钮操作方法必须具有以下签名：

-(void)buttonActionMethod:(id)inSender

这意味着您无法直接调用系统方法。对于你想要做的事情，我会建议这个方法：

//loads wav file into SoundID
NSURL *buttonURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"medic_taunts01" ofType:@"wav"]];
SystemSoundID soundID
AudioServicesCreateSystemSoundID((__bridge CFURLRef)buttonURL, &soundID );
self.SoundID = soundID;

//creates button
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[scrollview addSubview:button]

//this line is the problem
[button addTarget:self  action:@selector(playButtonSound:) forControlEvents:UIControlEventTouchDown];

请注意将SoundID转换为属性（我相信您知道如何制作这些属性）。然后定义此方法：

-(void)playButtonSound:(id)inSender {
    AudioServicesPlaySystemSound(self.SoundID);
}

当然，如果您有多个按钮，每个按钮都有不同的声音，那么您需要在此处获得更多创意，并将声音ID映射到按钮。

Answer 2

这是您编辑的答案。希望这会有所帮助：

-(void)viewDidLoad {

      NSURL *buttonURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"medic_taunts01" ofType:@"wav"]];
      AudioServicesCreateSystemSoundID((__bridge CFURLRef)buttonURL, &SoundID);

      //creates button
      UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
      [button setTitle:@"Show View" forState:UIControlStateNormal];
      button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
      [scrollview addSubview:button]

      //this line was causing problem
      [button addTarget:self action:@selector(playSound:) forControlEvents:UIControlEventTouchDown];


}


-(void)playSound:(id)sender{

       AudioServicesPlaySystemSound((SoundID)

  }

按钮以编程方式在iOS中播放声音

2 个答案: